President Donald Trump sharply questioned Attorney General Jeff Sessions and FBI Director Christopher Wray during a White House meeting on January 22 about why two senior FBI officials — Peter Strzok and Lisa Page — were still in their jobs despite allegations made by allies of the president that they had been disloyal to him and had unfairly targeted him and his administration, according to two people with knowledge of the matter.

The president also pressed his attorney general and FBI director to work more aggressively to uncover derogatory information within the FBI’s files to turn over to congressional Republicans working to discredit the two FBI officials, according to the same sources.

The very next day, Trump met Sessions again, this time without Wray present, and even more aggressively advocated that Strzok and Page be fired, the sources said.

Trump’s efforts to discredit Strzok and Page came after Trump was advised last summer by his then-criminal defense attorney John Dowd that Page was a likely witness against him in special counsel Robert Mueller’s investigation into whether Trump obstructed justice, according to two senior administration officials. That Trump knew that Page might be a potential witness against him has not been previously reported or publicly known.

The effort to discredit Strzok and Page has been part of a broader effort by Trump and his allies to discredit and even fire FBI officials who they believe will be damaging witnesses against the president in Mueller’s obstruction of justice probe.

Those attacks, in turn, are part of a broader push to denigrate Mueller himself and make it easier for Trump to publicly justify his potential firing. Those efforts have taken on new urgency as Mueller continues to rack up guilty pleas from former senior Trump officials like Michael Flynn and Rick Gates, and after the FBI, in conjunction with other federal prosecutors, raided the office, home, and hotel room of Michael Cohen, Trump’s longtime lawyer. Trump’s fury over the raid has made many of his closest advisers worry that he’s inching closer to firing Deputy Attorney General Rod Rosenstein, who oversees the Mueller probe, and possibly Mueller as well.

Last May, Trump fired James Comey as FBI director, who today appears to be the special counsel’s most crucial witness against the president. Trump also enlisted his attorney general to pressure current FBI Director Wray earlier this year to fire then-FBI Deputy Director Andrew McCabe. Wraythought the pressure was so improper that he threatened to resign if it did not end.

Trump’s efforts against Page and Strzok demonstrate that the president personally has targeted even midlevel officials and career FBI agents.